Visited 14.4.10.
Easily seen from the B3280. Park at the field gate and access is a straight 2 minute walk through 2 field gates / 2 fields. The site consists of a large mound of stones. There is no public right of way to the field in which the cairn stands so you need to either seek permission or do what I did – make a dash for it!
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There ought to be several footpaths giving access to the common land of hangman's barrow - particularly one path up 'hangman's hill'. None are currently marked, and landowner has built a wall over one!